Compensating valve



Fs. G. NEAL.

COMPENSATING VALVE. APPLICATION man 1AN.3.192|.

W. 48313,4O Paztnted Oct. 241, m22.

4 Twww igiss 38 'to the exhaust port Lil; This Willcut oli1 l `the equalizingg` reservoir? chamber 'i8 from the chamber 4:3 and connect said chamber to the exhaust port al. The vinward movement o'l the Valve 3'? Will uneoyerthe port l? to permit air to flow irom the application chamber i9 .into the chamber 43 to hold the pistonBl and valve in release position until the equalizing reservoir hasbeen ei;- hausted to zero, or approximately so.

rllhe port i7 may be connected to any in dependent source of air pressure, tlieapplication chamber of the distributing Valve being merely'y used as an illustration of one source from which `air pressure might be obtained for the purpose of holding the pis ton 34 and the valve 37 in release position While exhausting the equalizing reservoir chamber.` lt is only ncessary that the air from this independent source shall be oil suiicient pressure to hold the piston 34 in its release position against the pressure oiz the spring L6 and of the reduced brake pipe pressure in chamber 19. v i

llVhat l claim is:

l. The combination of a compensating; valve adapted to be operated by opposed `brake pipe and equalizinp; reservoir prestion i to `exhaust sures7 and a Vent Valve subject to brake pipe and equalizng reservoir pressures and adapted to be operated by equalizing reserm Voir pressure upon a suddenreduction el? brake pipe pressure to Vent the equalizing reservoir pressureto atmosphere. i

i 2. The combination of a compensating `valve adapted to be operated by opposed brake pipe and equalizing reservoir pres` sures, a vent valve subject tobralre pipe and equalizing` reservoir pressures and adapted to be operated by equalizingv reservoir pressure upon a sudden reduction of brake pipe pressure to vent the equalizinp;

i reservoir pressure to atmosphere, and means for admitting; air 'from a separate source of supply to said vent'valve to hold it in posithe equalizing reservoir pressure. y i l 3. rl`hefcombination of a compensating `valve 'adapted to be operated by opposed brake pipe and equalizing reservoir` pressures, a vent valve subiect to brake` pipe and equalizing reservoir `pressures and adapted to be operated by equalizing reser- `Voir pressure upon a sudden reduction of;

brake pipe pressure to Vent the equalizinp` reservoir pressure to atmosphere, means for,`

admitting air 'from a separate source of supply to said vent valve to holdit in posi-.

tion to exhaust the equalizing reservoir pressure, and means to `more said yalye lto `close the vent :trom the equalizinp; reservoir when the said reservoir pressure has `been reduced to Zero, or approximately so. y

4. A compensating Valve comprising a casing, a diaphragm therein and forming lease position.

titi

an equaliringresei'roir chamber and a brake pil e chamber, "a supply valve, a release valve, both of said Valves being adapted to beopei'ated Iby said diaphragm in response to variations ot pressure inthe equa-lining; reservoir cliamber,` the `supply 1valve being; opcnedfwhen the equa-lining; reservoir cham ber pressure exceeds the pressure in the.

vthe eclualizing` reservoir chamber.

5. A compensating valve comprising a casing, a diaphragm therein and forming an equalizing reservoir chamber and a brake pipe chamber, a supply yalve, a release valve7 both of said Valves beinga adapted to be operated by said diaphragm in response to `variations of pressure in theequalizing reservoir chamber, the supply valve being opened `when the equalizing reservoir chamber pressure exceeds the pressure in the brake pipe chamber and the release Valve being opened when the equaliziiig reservoir pressure is beloWthe brake pipeV pressure,

l'a Ventvalve :tor the equalizing; reservoir chamber, means whereby said valve will remain inactive during,` all slow changes ot pressure in the brake pipe and equalizinp;

reservoir chambers but Will be operated to release position by the pressure in the equalizing reservoir chamber upon a sudden re-V duction of pressure in the brake pipe chamber, touthereby exhaust the pressure from the equaliziugreservoir chamber, and means for admitting; air from a separate source of supply to temporarily hold the Valvein re `6. 'A compensating; Valve 'comprising a casing, a diaphragm therein and forming an edualizinp'` reservoir chamber `and a bralre pipe chamber,` a supply yalye, a release yalve,'both of said valves beingV adapted to be operated by said diaphragm in response ftoyariations or ressure inthe e ualizins i m5 reservoir chamber, the supply valve being opened when the equalizing reservoir chamber pressure exceeds the pressure `in the brake pipe chamber and the release valve beingopened when the equalizing reservoir pressure is below the brake pipe pressure, a `vent valve 'for the equalizingreservoir chamber,` means `whereby said valve will remain `inactive during all slow changes of pressure in the brake pipe and equalizing` reservoir chambers but Will be operated to ino iis

izo

release position by the pressure in the equallzlng reservolr Chamber upon a sudden reduetlon of pressure 1n thebrake plpe Chamber` to thereb 1 exhaust the aressure from the equalzng reservoir chamber, means for admitting air from a separate source o supply to temporarily hold the valve n release position, and means for returning the "valve to normal position to thereby close the exhaust port when the pressure 1n the 10 equalzing reservoir chamber has been reduced to zero, or approximately so.

In testimony whereof I hereunto ax my signature.

SPENCER G. NEAL. 

